616 90's Kitty.
AoA 90's Kitty.
I don't think Kitty ever formally used the codename "Ariel". As said above, she rejected it when Xavier suggested it and went right for Sprite.
Though she dismisses Ariel on panel immediately, the name did turn up in some promotional materials and products and most famously in the Graphic Novel GOD LOVES, MAN KILLS. So there must have been some behind the scenes shenanigans going on with deciding on the name.
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YES Capes. YES Masks. YES Secret Identities.
Upon closer examination, it appears that she took the name "Ariel" begrudgingly after graduating to full membership in the X-MEN and leaving behind her training outfit circa UNCANNY X-MEN #169, though she dislikes it enough to NOT encourage being called by her codename. Perhaps the change is meta-spurred by the introduction of Caliban of the Morlocks and his obsession with Kitty- referencing the characters Ariel and Caliban in Shakespeare's THE TEMPEST...
A good examination of the evolution of Kitty Pryde's identities here: https://arousinggrammar.com/2014/05/...f-kitty-pryde/
Protected by the Comics Code Authority
YES Capes. YES Masks. YES Secret Identities.
I wish she would get an updated version of that green costume.
TO KNOW HER IS TO FEAR HER: JESSICA DREW THE SPIDER-WOMAN
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MISSING:
Synch's Aura
Northstar and Aurora's shiny hair
Spider-Woman’s cowl costume